Double weft thread picking means for shuttleless looms



March 5, 1968 w. LIEBCHEN 3,371,588

DOUBLE WEFT THREAD PICKING MEANS FOR SHUTTLELESS LOOMS Filed May 11,1966 5 Sheets-Sheet 1 Inventor.- WALOEMAR LI'EBCHEN ATTORNEYS March 5,1968 w. LIEBCHEN DOUBLE WEFT THREAD PICKING MEANS FOR SHUTTLELESS LOOMS3 Sheets-Sheet 2 Filed May 11, 1966 Inventor: \NAL DEM A? L IE BCHE/V WeHun ATT RNEYS March 5, 1968 I w. LIEBCHEN DOUBLE WEFT THREAD PICKINGMEANS FOR SHUTTLELESS LOOMS Filed May 11, 1966 3 Sheets-Sheet 3Inventor: wALoeMAR 'LIEBC HEN i-Huflfig ATTORNEYS suin United StatesPatent ABSTRACT OF THE DISCLOSURE A shuttleless loom has, for thepurpose .of introducing threads simultaneously from the same side of theshed, carrier rods guided in pairs of rollers; the inner ends of thecarrier rods are pivoted to a carrier body which is guided for slidingmovement in a direction parallel to the length of the rods and is movedthrough a pivoted link by a swinging lever.

The invention relates to a shuttleless loom for pile fabrics with doubleweft thread picking using thread carriers which are introduced in pairsinto the double shed from at least one side of the fabric being woven.

For the actuation of the individual carrier rods on one side of thefabric in shuttleless looms for conventional weaving, in an operation inwhich only one weft thread is picked in a single shed, it is known toimpart the necessary movement to the rod by a link connected to anoscillating lever journalled in the plane of the swinging reed andmoving in synchronism with the slay. The link converts the oscillatorymotion of the lever to linear motion of the rod.

The use of this type of transmission of motion between driving lever andcarrier rod in a shuttleless loom for pile fabrics with double weftthread picking by means of a pair of carriers introduced into a doubleshed, however, presents certain difliculties. The two carrier rods mustbe guided accurately enough to assure a proper transfer of the weftthreads to the counter members. This suggests, in order to avoiddifferent transverse forces on the carrier rods, the use of two links,which are substantially parallel to each other and are connected to theswinging driving lever at different distances from its pivot. Thedifferent radii of oscillation result in different picking movements anddifferent speeds of movement for the two weft threads, which areundesirable for a number of reasons.

The primary object of the invention is to provide a shuttleless loomwhich overcomes these disadvantages, in which the two carriers areaccurately guided in exactly similar paths in their movement into thesheds and in which, as a consequence, the operation of the machine is asefiicient as possible, and the path of movement of the rods is reducedto a minimum.

According to the invention, this purpose is accomplished by mounting thecarriers on the ends of two carrier rods arranged parallel to eachother, which at points close to the web are reciprocably guided betweenpairs of rollers, while their ends remote from the web are pivotallyconnected to a guide body reciprocally movable in guide tracks orgrooves parallel to the carrier rods, the guide body being movable by aconventional oscillating lever through a link connection.

Further objects and advantages of the invention will appear more fullyfrom the following description, especially when taken in conjunctionwith the accompanying drawings which form a part thereof.

In the drawings:

FIG. 1 shows in side elevation a mechanism according to the inventionwith the nearer guide member cut away;

FIG. 2 is an enlargement of a part of FIG. 1;

FIG. 3 is a top plan view of a part of FIG. 1, with parts in section;and

FIG. 4 is a cross-section on the line 4-4 of FIG. 2.

FIG. 1 shows a lever 12 swingable about an axis 10 perpendicular to theslay, which in a conventional way is reciprocated in synchronism withthe slay from side to side of a generally vertical mid-position. A link16 is connected to the lever 12 by a pin 14, and the link is furtherconnected at 26, to a guide body 20, the lever 12 thus transmittingmotion to the guide body.

The guide body 20 is formed by two plates 22 and 24 arranged parallel toeach other and provided with aligned holes, the plates being held spacedapart by bolts 26, 28,

30, 32; the bolts having reduced end portions. The bolts are fastened inthe plates by set crews threaded in the bores 34, and provided withrounded ends which engage in grooves or depressions in the reduced endportions of the bolts.

The plates 22, 24 carry on their outer faces splines 36, 38, which areslidable in grooves 40, 42 in guide members 44, 46 positioned on bothsides of the plates. The guide members 44, 46 extend in a directiontransverse to the fabric being woven, approximately in the mid-pointbetween the two sheds, and are fastened on the slay or the machineframe.

The bolt 26 carries a needle bearing 48, by means of which the link 16is swingably held between the plates 22, 24. The bolts 28, 30 similarlycarry needle bearings 50, 52 by means of which the inner ends of twocarrier rods 54, 56 with end portions provided with eyes are pivoted onthe guide body 20.

At a point directly in front of the entrance into the shed are two pairsof rollers 62, 64 and 66, 68 between which the outer ends of the carrierrods are guided. The rollers being freely journalled on the slay or themachine frame, whichever carries the guide members 44, 46. The guideroller axes are perpendicular to the direction of the grooves 40, 42, sothat the carrier rods during swinging of the lever 12 remain absolutelyparallel to each other in all positions. This assures that carrier rodsmove parallel to each other into the web and the transfer of the weftthreads is accomplished without difiiculty. In addition, the friction inthe arrangement of the invention is quite low, because sliding frictionis present only between the splines and the groove surfaces of the guideand the rolling friction between the carrier rods and the rolls is sosmall that it can be disregarded. The increase in power required formoving the carrier rods as compared with the power required in aconventional machine having only a single carrier rod on each side ofthe web is consequently determined practically only by the increase inmass of the two carrier rods and the guide body; in which connection itshould be borne in mind that the use of two links is avoided.

The guide members in which the guide body is mounted is located betweenfirst and second horizontal planes which contain the axes of the pivotsof the carrier rods and the longitudinal axes of the carrier rods, andare symmetrical with respect to a third plane equidistant from the firstand second planes.

While I have described herein one embodiment of my invention, I wish itto be understood that I do not intend to limit myself thereby exceptwithin the scope of the claims hereto or hereinafter appended.

I claim:

1. An arrangement for use in a shuttleless loom for weaving pile fabric,for introducing simultaneously two weft threads from the same side intoa shed, comprising two parallel thread carrier rods, two pairs ofrollers 3 mounted to rotate freely about parallel axes substantiallyperpendicular to the longitudinal axes of the carrier rods, one of thecarrier rods fitting between the rollers of each of the pairs, a guidebody, means pivoting the inner ends of the carrier rods to the guidebody, means mounting the guide body for sliding movement in a directionparallel to the longitudinal axes of the carrier rods, a lever mountedto swing about an axis, and a link pivoted to the lever and to the guidebody.

2. In an arrangement as claimed in claim 1, said guide body mountingmeans comprising guide members located between first and second planescontaining the axes of said pivoting means and the longitudinal axes ofthe rods.

3. In an arrangement as claimed in claim 2, said link being pivoted tosaid guide body about an axis lying in a third plane parallel to andintermediate between said first and second planes.

4. In an arrangement as claimed in claim 3, said third plane beingequidistant from the first and second planes, and said guide membersbeing symmetrical with respect to said third plane.

5. In an arrangement as claimed in claim 1, said guide body mountingmeans comprising guide members on each side of the guide body havinggrooves therein extending parallel to the longitudinal axes of thecarrier rods, said guide body having splines slidably engaged in saidgrooves.

6. In an arrangement as claimed in claim 5, said guide body comprisingspaced parallel plates, said splines being mounted on the outer faces ofthe plates, bolts extending between the plates, said carrier rods andsaid link having portions located between the plates pivoted on saidbolts.

7. In an arrangement as claimed in claim 1, said guide body comprisingspaced parallel plates, bolts extending between the plates, said carrierrods and said link having portions located between the plates pivoted onsaid bolts.

References Cited UNITED STATES PATENTS 1,943,662 1/1934 Emery et a1139123 2,818,882 1/1958 Haberhauer 139123 3,266,528 8/1966 Liebchen139-122 FOREIGN PATENTS 797,163 2/1936 France.

HENRY S. JAUDON, Primary Examiner.

